Thanks, you've got a big enough swap file - maybe 50 times too big. You missed the free command though, which would tell us if it was using it. Please type the command "free" and give us the output.
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fabricator4Oct 7 '12 at 10:17

I confirm the correct file is /etc/polkit-1/localauthority/50-local.d/com.ubuntu.desktop.pkla, not /var/lib...
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fabricator4Oct 7 '12 at 11:05

Something strange here - the swap partition appears to be huge - /dev/sda6 is 166Gb. Maybe someone could check my figures? The swap given above is 4Gb. Is it a swap file? Linux hibernation to a swap file is none-trivial and needs to be set up correctly by my understanding.
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fabricator4Oct 7 '12 at 11:09